Feature: 1. Multifunction: This 3 in 1 water quality tester can quickly and accurately measure PH, total dissolved solids value and temperature in water quality. 2. Backlight Function: Total dissolved solids tester has unique backlight function, which makes it easy to read and detect measurements even in the dark. 3. Portable for Versatile Use: With its lightweight design, this water quality tester pen is perfect for both indoor and outdoor use. 4. Accurate Sensor: The water PH tester comes with a high accuracy sensor that ensures accurate and reliable results. 5. Durable: Water quality testing pen is made of ABS, durable, energy saving, to ensure long term use and stable performance, will not damage. Specification: Item Type: Water Quality Tester Material: ABS Power Supply: Requires 3 LR44 Button Batteries (not included). Package List: 1 x Water Quality Tester 3 x Accessories 1 x User Manual